Sexual Reproduction in Flowering Plants Test

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Sexual Reproduction in Flowering Plants Test - 102

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Question 1
1 / -0

Match column I with column II and select the correct option from the given codes.
Column I Column II
A. Anemophily (i) Grasses, Date palm
B. Hydrophily (ii) Rose, Jasmine
C. Entomophily (iii) Butea, Bignonia
D. Omithophily (iv) Vallisneria, Ceratophylium

A
A-(i), B-(iv), C-(ii), D-(iii)

B
A-(i), B-(iv), C-(iii), D-(ii)

C
A-(ii), B-(iii), C-(i), D-(iv)

D
A-(ii), B-(i), C-(iii), D-(iv)

Solution

Anemophily
It is a form of pollination when pollen grains are distributed by wind. Also, called the anemophilous flower.
Anemophilous pollen grains are light and non-sticky. So, that it can be transferred by air currents. Wind-pollinated flowers are inconspicuous and they not showy and also devoid of nectar etc. as seen in grass
Hydrophily
It is a form of pollination when the pollination takes place through the agency of water.
It is of two types :
Hydrophily: Plants which are pollinated inside the water. e.g. Zoster, Ceratophyllum
Epihydrophilly: Plants which are pollinated outside the water or on the surface of the water. e.g. Vallisneria
Entomophily
It is a type of pollination, which takes py insect. Insect-pollinated flowers are made attractive in different ways and the pollens are sticky with a rough surface. So, that they may easily stick to insect limbs. e.g. Rose
Ornithophily
It is the form of pollination when the pollination takes place by birds. e.g. Begonia, Bottlebrush, Butea
So, the correct option is 'C'
Question 2
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Which of the given statements are true?
(i) During the development of a dicot embryo, heart-shaped embryo is followed by globular embryo.
(ii) The part of embryonal axis above the level of cotyledons is epicotyl, while the part below the level of cotyledons is hypocotyl.
(iii) Monocot seeds possess a single cotyledon represented by scutellum.

A
(i) and (ii)

B
(ii) and (iii)

C
(i) and (iii)

D
(i), (ii) and (iii)

Solution

During the development of dicot embryo, initially the dicot embryo is globular and undifferentiated. Early embryo with radial symmetry is called pro-embryo. It is transformed into embryo with the development of radicle, plumple and cotyledons. Two cotyledons differentiate from the sides with a faint plumle in the centre. At this time the embryo becomes heart-shaped.
Part of embryo axis between the plumple and cotyledonary node is epicotyle (the level of cotyledons) while the part between radicle and cotyledonary node is called hypocotyl (the level of cotyledons).
The single cotyledon of monocotyledonous seed(e.g., maize grain) is called scutellum. It occupies the major portion of the embryo regions of grain.
So, the correct answer is '(ii) and (iii)'.
Question 3
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Choose the correct answers from the alternatives given.
Cheiropteriphily is the name given to pollination by

A
birds

B
bats

C
insects

D
aquatic animals

Solution

Bat-pollinated flowers tend to be large and showy, white or light coloured, open at night and have strong musty odours. They are often large and bell-shaped or a ball of stamens. Flowers are typically borne away from the trunk or other obstructions. More than 500 species of plants, spanning 67 plant families, are pollinated by bats. This pollination syndrome is known as chiropterophily. In general, flowers that use this approach tend to be white or dull in colour, open at night, rich with nectar, and musty or rotten smell.
So, the correct option is, 'bats'.
Question 4
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The part of the embryo between the cotyledons and the embryonic root (radicle) is caved

A
hypocotyl

B
epicotyl

C
plumule

D
choleorhiza

Solution

The part of the stem of an embryo plant beneath the stalks of the seed leaves or cotyledons and directly above the root is called hypocotyl. In the developing embryo, the hypocotyl is the embryonic axis that bears the seedling leaves (cotyledons). Upon germination, the hypocotyl pushes the cotyledons above the ground to develop. It eventually becomes part of the plant stem.
So, the correct option is, 'hypocotyl'.
Question 5
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In a case of polyembryony, if an embryo develops from the synergid and another from the nucellus, then the synergid embryo is $$\underline{(i)}$$ and nucellar embryo is $$\underline{(ii)}$$.

A
(i) triploid, (ii) haploid

B
(i) diploid, (ii) haploid

C
(i) haploid, (ii) diploid

D
(i) diploid, (ii) triploid
Solution
The occurrence of more than two embryos in the Seed is known as polyembryony.
Synergids cells are haploid (n). An embryo formed from a synergids cell will be haploid as well since it doesn’t undergo fertilization with a male gamete.
Nucellus is diploid (2n). An embryo formed from a nucellus will be diploid in nature too as it doesn’t undergo fertilization either.
So, the correct option is C.
Question 6
1 / -0

In albuminous seeds, food is stored in ________ and in non-albumious seeds, it is stored in ___________.

A
Endosperm, cotyledons

B
Cotyledons, endosperm

C
Nucellus, cotyledons

D
Endosperm, radicle

Solution

Albuminous seeds are the seeds which have food stored in the special nourishing tissue called as endosperm that remains persistent till maturity. Cotyledons only act as food sucking organs and not food storage organs e.g., Castor seed. Non-albuminous seeds are the seeds which have the stored food and the cotyledons in a special structure called as a kernel. It does not remain until the embryo is mature. e.g. Pea seed.
So, the correct option is 'Endosperm, cotyledons'.
Question 7
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Endospermic seeds are found in.

A
Castor

B
Barley

C
Coconut

D
All of these

Solution

Endospermic seeds are those that have an endosperm in the mature seed. It is fleshy, oily, surrounds the embryo, and functions as the sole food storage organ. Inside the seed coat, a thin and papery cotyledon is present. Monocot plants have endospermic seeds.
So, the correct option is 'All of these'.
Question 8
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The ploidy of aleurone layers is

A
n

B
2n

C
3n

D
4n

Solution

In the flowering plants, endosperm cells are triploid in nature formed after triple fusion, the outer proteinous layer of the endosperm is the aleurone layer which is also a triploid (3n).
So, the correct answer is '3n'.
Question 9
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Which of the following statements about pollen and pollination is false?

A
Evolution of the pollen grain rejected the need for swimming sperm in flowering plants

B
At maturity, the pollen grain consists of two sperm nuclei and a tube nucleus

C
The pollen tube enters the female gametophyte through the style

D
The pollen grain makes twice the genetic contribution to endosperm cells than it does to the cells of the embryo

Solution

A fertilized egg develops into a sporophyte embryo. While some primitive gymnosperms have flagellated sperm cells, the sperm in most gymnosperms and all angiosperms lack flagella. In seed plants, the use of resistant, far-traveling, airborne pollen to bring gametes together is a terrestrial adaptation. So the statement of option A is correct.
But the endosperm has a diploid nucleus and the pollen grain has two male -haploid gametes, so the overall gene contribution of the endosperm and the pollen grain is equal.
So the correct answer should be option D, The pollen grain makes twice the genetic contribution to endosperm cells than it does to the cells of the embryo.
Question 10
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The character associated with the plant in which pollination is by Tageticula.

A
Marginal placentation

B
Pentamerous flowers

C
Trilocular ovary

D
Perigynous flowers.

Solution

Tageticula is a moth which deposits its egg in the ovary of the Yucca flower. Simultaneously it collects pollen and deposits the same in the hollow of stigma to effect pollination. The plants can reproduce vegetatively but the moths appear to be critical for sexual propagation. Yucca plant has a trilocular ovary means it contains 3 chambers or 3 locules.
So, the correct answer is C.
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Re-Attempt Weekly Quiz Competition

Column I	Column II
A. Anemophily	(i) Grasses, Date palm
B. Hydrophily	(ii) Rose, Jasmine
C. Entomophily	(iii) Butea, Bignonia
D. Omithophily	(iv) Vallisneria, Ceratophylium

Sexual Reproduction in Flowering Plants Test - 102

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Sexual Reproduction in Flowering Plants Test - 102

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Question 1

A-(i), B-(iv), C-(ii), D-(iii)

A-(i), B-(iv), C-(iii), D-(ii)

A-(ii), B-(iii), C-(i), D-(iv)

A-(ii), B-(i), C-(iii), D-(iv)

Solution

Question 2

(i) and (ii)

(ii) and (iii)

(i) and (iii)

(i), (ii) and (iii)

Solution

Question 3

birds

bats

insects

aquatic animals

Solution

Question 4

hypocotyl

epicotyl

plumule

choleorhiza

Solution

Question 5

(i) triploid, (ii) haploid

(i) diploid, (ii) haploid

(i) haploid, (ii) diploid

(i) diploid, (ii) triploid

Solution

Question 6

Endosperm, cotyledons

Cotyledons, endosperm

Nucellus, cotyledons

Endosperm, radicle

Solution

Question 7

Castor

Barley

Coconut

All of these

Solution

Question 8

n

2n

3n

4n

Solution

Question 9

Evolution of the pollen grain rejected the need for swimming sperm in flowering plants

At maturity, the pollen grain consists of two sperm nuclei and a tube nucleus

The pollen tube enters the female gametophyte through the style

The pollen grain makes twice the genetic contribution to endosperm cells than it does to the cells of the embryo

Solution

Question 10

Marginal placentation

Pentamerous flowers

Trilocular ovary

Perigynous flowers.

Solution

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